Thaw the pastry sheet at room temperature for 40 minutes or until it's easy to handle. Heat the oven to 400 degrees F. Line a baking sheet with parchment paper.,______,Arrange the asparagus on the pastry in a single layer. Sprinkle with the prosciutto, fontina and thyme.,Bake for 20 minutes or until the pastry is golden and the asparagus is tender.